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CHAPTER 27 Web API and Single-page Applications In this chapter, I describe the Web API feature, which is a relatively new addition to the ASP.NET platform that allows you to quickly and easily create Web services that provide an API to HTTP clients, known as Web APIs. The Web API feature is based on the same foundation as the MVC Framework applications, but is not part of the MVC Framework. Instead, Microsoft has taken some key classes and characteristics that are associated with the System.Web.Mvc namespace and duplicated them in the System.Web.Http namespace. The idea is that Web API is part of the core ASP.NET platform and can be used in other types of Web applications or used as a stand-alone Web services engine. I have included Web API in this book because one of the main uses for it is to create single-page applications (SPAs) by combining the Web API with MVC Framework features you have seen in previous chapters. I’ll explain what SPAs are and how they work later in the chapter. That is not to take away from the way that Web API simplifies creating Web services. It is a huge improvement over the other Microsoft Web service technologies that have been appearing over the last decade or so. I like the Web API and you should use it for your projects, not least because it is simple and built on the same design that the MVC Framework uses. I start this chapter by creating a regular MVC Framework application and then using the Web API to transform it into a singlepage application. This is a surprisingly simple example, so I have treated the process like an extended example and applied some of the relevant techniques from earlier chapters because you can never have enough examples. Table 27-1 provides the summary for this chapter. Table 27-1. Chapter Summary Problem Solution Listing Create a RESTful web service Add a Web API controller to an MVC Framework application. 1–10 Map between HTTP methods and action names in a Web API controller Apply attributes such as HttpPut and HttpPost to the methods. 11 Create a single-page application Use Knockout and jQuery to obtain data via Ajax and bind it to HTML elements. 12–17 Understanding Single-page Applications The term single-page application (SPA) is a broadly applied term. The most consistently-used definition is a web application whose initial content is delivered as a combination of HTML and JavaScript and whose subsequent operations are performed using a RESTful web service that delivers data via JSON in response to Ajax requests. This differs from the kind of application I have been building in most of the chapters of this book, where operations performed by the user result in new HTML documents being generated in response to synchronous HTTP requests, which I will refer to as round-trip applications (RTAs). The advantages of a SPA are that less bandwidth is required and that the user receives a smoother experience. The disadvantages are that the smoother experience can be hard to achieve and that the complexity of the JavaScript code required for a SPA demands careful design and testing. Most applications mix and match SPA and RTA techniques, where each major functional area of the application is delivered as a SPA, and navigation between functional areas is managed using standard HTTP requests that create a new HTML document. Preparing the Example Application For this chapter, I created a new ASP.NET project called WebServices using the Empty template. I checked the options to 704
add the folders and references for both MVC and Web API applications, as shown in Figure 27-1. Figure 27-1. Creating the project with the MVC and Web API references I will use this project to create a regular MVC Framework application and then use the Web API to create a web service. Once the web service is complete, I’ll return to the MVC Framework application and make it into a single-page application. Creating the Model This application will create and maintain a series of reservations. I want to keep the application simple so that I can focus on the mechanics of the features I describe, and so these reservations will consist of just a name and a location. I added a class file called Reservation.cs to the Models folder, the contents of which are shown in Listing 27-1. Listing 27-1. The Contents of the Reservation.cs File namespace WebServices.Models { public class Reservation { public int ReservationId { get; set; } public string ClientName { get; set; } public string Location { get; set; } } } I am going to create a simple in-memory collection of Reservation objects to act as the model repository. I don’t want to go to the trouble of setting up a database, but I do need to be able to perform CRUD operations on a collection of model objects so that I can demonstrate some important aspects of the Web API. I added a class file called 705
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Pro ASP.NET MVC 5 Adam Freeman 2
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Dedicated to my lovely wife, Jacqui
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Contents About the Author About the
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Preparing the Example Project Defin
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Chapter 9: SportsStore: Completing
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Constraining Routes Constraining a
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Using Other Filter Features Filteri
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Creating the Ajax Form Understandin
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Index 18
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About the Technical Reviewer Fabio
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What Is Wrong with ASP.NET Web Form
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storage and querying language for s
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There are some good reasons for car
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Where Can I Get the Example Code? Y
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Figure 2-1. The Visual Studio ASP.N
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Figure 2-3. The initial file and fo
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Figure 2-6. Adding a controller to
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} } } return View(); A good way of
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Figure 2-9. The MVC Framework tryin
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Visual Studio will create a file ca
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Afternoon"; } } } return View(); I
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Figure 2-14. Adding to the view HTM
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public class HomeController : Contr
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} Will you attend? @Html.DropDown
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Figure 2-18. Setting the default st
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type without needing to qualify the
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[Required(ErrorMessage = "Please en
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Figure 2-21. The validation summary
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Tip You can drag JavaScript and CSS
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expect files to be in certain locat
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RSVP @using (Html.BeginForm()) {
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Thanks body { background-colo
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CHAPTER 3 The MVC Pattern Before I
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ASP.NET MVC doesn’t apply any con
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as thinly disguised Smart UI applic
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this case PasswordResetHelper. I do
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Web server and database. Integratio
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public class AdminControllerTests {
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The drawback of TDD is that it requ
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} } } return "Navigate to a URL to
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namespace LanguageFeatures.Controll
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} set { name = value; } } } public
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The listing demonstrates how to con
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using System.Collections; using Sys
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using System.Collections.Generic; n
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public static IEnumerable FilterByC
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Products = new List { new Product {
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... In this example, myAnonType is
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public string Index() { return "Nav
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Max Min Returns the largest or smal
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usiness while the background work i
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natural syntax, but they do not cha
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} Defining the Controller I am goin
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Note Notice that I declare the view
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Figure 5-4. Creating a new layout S
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Figure 5-5. The Effect of Applying
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Figure 5-6. Adding a view that reli
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Figure 5-9. The content in the layo
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public ActionResult DemoExpression(
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The containing element has data at
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Price@Model.Price Stock Level @sw
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} else { @ViewBag.ProductCount }
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Figure 5-13. Generating elements us
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CHAPTER 6 Essential Tools for MVC I
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LinqValueCalculator to determine th
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In the sections that follow, I expl
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just fine with MVC 5. I have used t
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namespace EssentialTools.Infrastruc
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Figure 6-2. The effect of running t
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I can configure the objects that Ni
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} } The FlexibleDiscountHelper clas
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public object GetService(Type servi
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Figure 6-4. Creating the unit test
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} } } // assert Assert.AreEqual(tot
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wrong"); wrong"); wrong"); } Assert
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} } } Testing and Fixing the Code I
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Listing 6-31. The Contents of the L
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Price = 48.95M}, new Product {Name
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To summarize the example, the Objec
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This is the same behavior used in t
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CHAPTER 7 SportsStore: A Real Appli
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e included in new projects are exce
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public class NinjectDependencyResol
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Figure 7-4. Creating the Product cl
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IProductRepository interface with t
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Figure 7-5. Adding the Views/Produc
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Figure 7-6. Viewing the basic appli
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Figure 7-8. Setting up the SportsSt
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Visual Studio will display a design
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Creating the Entity Framework Conte
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private EFDbContext context = new E
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public class ProductController : Co
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A view model is not part of the dom
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... ... Every namespac
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(ProductsListViewModel)controller.L
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Figure 7-14. Displaying page naviga
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Figure 7-15. The new URL scheme dis
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} @foreach (var p in Model.Products
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Figure 7-18. Creating a partial vie
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Summary In this chapter, I built mo
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using System.Collections.Generic; u
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Assert.AreEqual(pageInfo.TotalPages
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); "", new { controller = "Product"
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} } public string Menu() { return "
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has the effect of declaring a depen
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Figure 8-3. The category links High
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Now that I am providing information
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} ... CurrentCategory = category };
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Continue Shopping button to return
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Arrange - create a new cart Cart ta
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@Model.Name @Model.Price.ToString("
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For the AddToCart and RemoveFromCar
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and the total cost for the cart. Th
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CHAPTER 9 SportsStore: Completing t
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using System.Linq; using System.Web
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public void Adding_Product_To_Cart_
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shopping I added a new column to e
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@ViewBag.Title SPORTS STORE @
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. . . This change generates a link
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@Html.TextBoxFor(x => x.Zip, new {@
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} ViewBag.Title = "SportStore: Chec
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public string Country { get; set; }
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if (emailSettings.WriteAsFile) { sm
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} } } I created an EmailSettings ob
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ViewResult result = target.Checkout
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of the SportsStore.WebUI project an
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Thanks! Thanks for placing your ord
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Figure 10-1. Displaying the SportsS
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waking moment. My advice is to acce
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case, however, I hide the standard
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Bootstrap that the div element shou
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.Select(x => x.Category) .Distinct(
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@Html.ActionLink("Home", "List", "
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variations on the same basic theme.
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} This view uses a Razor foreach
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Figure 10-9. The effect of mobile-s
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public class AdminController : Cont
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Right-click on the Views/Admin fold
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Figure 11-3. Rendering the scaffold
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Figure 11-4. Rendering the modified
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Act Product p1 = target.Edit(1).Vie
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} } public string Category { get; s
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Figure 11-7. Displaying the editor
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Framework does know about and updat
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ActionResult result = target.Edit(p
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using System.ComponentModel.DataAnn
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Install-Package Microsoft.jQuery.Un
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Listing 11-17. Explicitly Specifyin
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Listing 11-19. Implementing Deletio
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You can see the delete feature by c
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Authentication is set
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Figure 12-1. The effect of the Auth
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namespace SportsStore.WebUI.Infrast
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the menu, set the name to Login and
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mock implementations of the IAuthPr
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Figure 12-3. Adding columns to the
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No Image } else { } @Html.Acti
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} } I have added a new parameter to
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[TestClass] public class ImageTests
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Figure 12-4. Adding an image to a p
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CHAPTER 13 Deployment The final, an
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Figure 13-2. Creating a new web sit
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Figure 13-4. The effect of creating
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); [ProductID] INT IDENTITY (1, 1)
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Figure 13-8. The Publish Web dialog
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Figure 13-10. Settings for the depl
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Figure 13-12. Previewing the deploy
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Figure 13-14. The SportsStore appli
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Figure 14-1. Selecting the project
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which packages are used by selectin
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} Or you can disable any layout for
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using System.Web.Mvc; namespace Deb
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If the debug attribute in the Web.c
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Figure 14-9. Hitting a breakpoint N
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Figure 14-11. The effect of assigni
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selecting Delete Breakpoint from th
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Figure 14-15. Enabling Edit and Con
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Figure 14-16. The effect of correct
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Figure 14-18. Selecting multiple br
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CHAPTER 15 URL Routing Before the i
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public class HomeController : Contr
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Figure 15-3. The segments in an exa
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started, which leads to the RouteCo
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namespace UrlsAndRoutes.Tests { [Te
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TestRouteMatch and TestRouteFail co
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Figure 15-5. Using default values t
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In Listing 15-12, I defined a new r
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Notice that, once again, I have pla
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Figure 15-8. Displaying the value o
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namespace UrlsAndRoutes { public cl
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... [TestMethod] public void TestIn
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Figure 15-11. The error displayed w
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"Home/{action}/{id}/{*catchall}", n
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namespace UrlsAndRoutes.Infrastruct
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Using Attribute Routing All of the
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Caution The Route attribute stops c
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} } public ActionResult List() { Vi
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... [Route("∼/Test")] ... Prefixi
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using System.Web.Routing; namespace
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Now, this may seem like a long path
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"Admin") @Html.ActionLink("This
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... Start the application again and
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ActionName The controller is: @Vi
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} For the routing in the example ap
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how outgoing URLs are generated. To
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and repeat the process. If the clas
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ActionName The controller is: @
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The MVC Framework supports organizi
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To demonstrate the way that areas i
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able to request /Admin/Home/Index a
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You do not need to take any special
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intercept requests for disk files b
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outes.Add(new Route("SayHello", new
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http://www.amazon.com/books/pro-asp
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CHAPTER 17 Controllers and Actions
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System.Web.Routing.RequestContext o
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namespace ControllersAndActions.Con
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Retrieve posted data from Request.F
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After a controller has finished pro
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public string Url { get; set; } pub
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RedirectToRouteResult Issues an HTT
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shown in this test method. using Sy
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You can send an object to the view
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Arrange - create the controller Exa
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Listing 17-20. Redirecting to a Lit
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Act - call the action method Redire
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Listing 17-24. Sending a Specific S
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CHAPTER 18 Filters Filters inject e
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} } To create the view that will ga
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} } public ViewResult Create() { //
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} } void OnAuthorization(Authorizat
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Figure 18-2. Re-prompting for crede
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[HttpPost] public ActionResult Logi
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} } public void OnAuthenticationCha
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using System.Web.Mvc; using System.
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IExceptionFilter { public void OnEx
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Figure 18-3. The default exception
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} } } } filterContext.ExceptionHand
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Figure 18-6. An exception thrown wh
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Table 18-9. HandleErrorInfo Propert
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using System.Web.Mvc; using Filters
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", } } } } string.Format("Action me
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execute the result. You can see how
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Figure 18-10. The effect of adding
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up manually with the Empty template
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I have already explained that filte
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Figure 18-14. Specifying the order
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Figure 18-15. The default filter be
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CHAPTER 19 Controller Extensibility
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} } } public ViewResult List() { re
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} public GetControllerSessionBehavi
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My implementations of the GetContro
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RouteConfig.RegisterRoutes(RouteTab
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} } You can see the effect of the c
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There are no action methods in this
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Figure 19-6. Using the method name
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[ActionName("Enumerate")] public Vi
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} } } }); I have used the ActionNam
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If you start the application and na
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Message: @Session["Message"] ... Th
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Data: @Model When you run the ap
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namespace ControllerExtensibility.C
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string viewName, string masterName,
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ModelState Returns information abou
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view) { } } public void ReleaseView
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Figure 20-2. Requesting an unsuppor
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Listing 20-10. The Contents of the
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Table 20-4. Razor View Engine Searc
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Figure 20-5. The effect of custom l
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Tip My custom view engine locations
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You can check to see if a view has
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I am going to start by creating a p
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@foreach (string str in Model) { @s
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"Pear"}) @Html.Action("Time") You c
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} In the Index action method, I pas
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Here is the message: @Model Inli
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Table 21-3. Useful Properties Defin
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troublesome string to the view as t
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Figure 21-3. Comparing how data val
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Figure 21-5. The effect of selectiv
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@model HelperMethods.Models.Person
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Note Using the helper methods to g
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Layout = "/Views/Shared/_Layout.csh
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} This produces the following form
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... Generating the Input Element fr
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} CreatePerson @using(Html.BeginRou
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CreatePerson label { display: i
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} public class Address { public str
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@{ ViewBag.Title = "CreatePerson";
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Notice that the elements for the Pe
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} return View((object)message); } }
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01/01/0001 00:00:00 Although the
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.editor-field input { height: 20px;
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The value of the property (0 in thi
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[Display(Name = "Birth Date")] publ
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Url Displays the data as a URL (usi
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} public string LastName { get; set
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Figure 22-10. Displaying a complex
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Views/Shared/EditorTemplates folder
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CHAPTER 23 URL and Ajax Helper Meth
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.editor-label { clear: left; } .edi
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action="GetPeople"}) This view co
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Figure 23-2. A simple synchronous f
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I am now ready to start applying un
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as shown in Listing 23-10. Listing
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Setting Ajax Options I can fine-tun
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ViewBag.Title = "GetPeople"; Layout
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Figure 23-6. Prompting the user bef
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I can address this using the AjaxOp
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ole}), } }) Url = Url.Action("Get
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Since I want to present the same da
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Figure 23-9. Working with JSON data
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using System; using System.Collecti
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@foreach (string role in Enum.GetNa
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public class Address { public strin
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Figure 24-1. A simple demonstration
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for the id parameter as follows: 1.
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Figure 24-4. The effect of using a
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This view renders a simple set of l
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Role:@Html.DisplayFor(m => m.Role)
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} Submit You can see the problem if
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using System.Web.Mvc; using MvcMode
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Listing 24-24. Using a Collection A
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... When the form is submitted, th
Page 654 and 655: Each of the classes listed in Table
Page 656 and 657: } } } if (ContainsPrefix(key)) { re
Page 658 and 659: Figure 24-10. The effect of the cus
Page 660 and 661: using System.Web; using System.Web.
Page 662 and 663: CHAPTER 25 Model Validation In the
Page 664 and 665: @ViewBag.Title .field-validati
Page 666 and 667: Listing 25-7. Explicitly Validating
Page 668 and 669: Figure 25-2. Errors result in highl
Page 670 and 671: ... Please enter your name Please
Page 672 and 673: Figure 25-4. Displaying validation
Page 674 and 675: Figure 25-6. A validation message f
Page 676 and 677: RegularExpression Required [Require
Page 678 and 679: Figure 25-8. The error message from
Page 680 and 681: } } [MustBeTrue(ErrorMessage="You m
Page 682 and 683: name")); } if (DateTime.Now > Date)
Page 684 and 685: Both of these settings must be true
Page 686 and 687: The feedback is also immediate when
Page 688 and 689: } public JsonResult ValidateDate(st
Page 690 and 691: has provided is consistent with the
Page 692 and 693: namespace ClientFeatures.Models { p
Page 694 and 695: } function processResponse(appt) {
Page 696 and 697: Figure 26-2. Disabling the browser
Page 698 and 699: undles.Add(new StyleBundle("∼/Con
Page 700 and 701: ... You won’t need to do this i
Page 702 and 703: Figure 26-4. Profiling with bundles
Page 706 and 707: ReservationRepository.cs to the Mod
Page 708 and 709: } return RedirectToAction("Index");
Page 710 and 711: The view model for the partial vie
Page 712 and 713: elated actions, and makes creating
Page 714 and 715: This time, the Web API controller h
Page 716 and 717: using System.Collections.Generic; u
Page 718 and 719: }; function sendAjaxRequest(httpMet
Page 720 and 721: Underpinning the Ajax functions is
Page 722 and 723: Figure 27-3. Monitoring the connect
Page 724 and 725: ... function removeItem(item) { sen
Page 726 and 727: Client Name Location Save }
Page 728 and 729: Simplify the Home Controller The Ho
Page 730 and 731: Remove Create Create Rese
Page 732 and 733: Index A Account Controller contents
Page 734 and 735: BeginForm and BeginRoute Form metho
Page 736 and 737: Custom dependency resolver contents
Page 738 and 739: table data script button SQL statem
Page 740 and 741: uilt-In form (see Built-in form hel
Page 742 and 743: Razor expression shared View Start
Page 744 and 745: PartyInvites routing system Solutio
Page 746 and 747: O OnActionExecuted method action fi
Page 748 and 749: accessing ways context objects acti
Page 750 and 751: summary, cart definition cart and c
Page 752 and 753: whole-model templated helpers Test-
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